Pitting corrosion identification approach based on inverse finite element method for marine structure applications. (1st April 2023)

• Record Type: Journal Article
• Authors: Ghasemzadeh, Maryam; Mokhtari, Mojtaba; Bilgin, Mahmut Hudayi; Kefal, Adnan
• Is Part Of: Ocean engineering. Volume 273(2023)
• Publication Date: 2023-04-01
• Subjects: Corrosion damage detection -- Inverse finite element -- Structural health monitoring -- Marine structures; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2023.113953
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: This paper presents a state-of-the art inverse finite element method (iFEM) for full-field, real-time structural health monitoring (SHM) of corroding structures. The study focuses on detecting the location and identifying the extent of pitting corrosion, which is one of the most hazardous forms of corrosion due to the difficulties regarding its prediction and detection. For this purpose, high-fidelity finite element (FE) models of corroded samples with complex-shaped, semi-ellipsoidal, and cylindroconical defects are developed to replicate the strain field of pitting corroded structures. The strain fields produced by the FE models, verified against experimental data, are reconstructed by the iFEM model using a robust and practical four-node quadrilateral inverse-shell element, iQS4. A strain-based damage criterion is defined to obtain the damage distribution and the location of corrosion pits on dog-bone tensile test samples with full sensor iFEM and coupled iFEM-GA reduced sensor technique. Finally, in a practical example of a structure with complex geometry, the proposed method's performance is assessed through detecting the location of corrosion damage on a cylindrical marine structure with axial stiffeners. Highlights: The inverse finite element method is applied for corrosion damage detection for the first time. A priori sensor sites are determined through genetic optimization of sensor positions. Complex-shaped corrosion damage is fully identified using low-cost sensor placement models. The practical utility of the iFEM approach is revealed for marine structure applications.